Proceedings of the 2003 World Water and Environmental Resources Congress, held in Philadelphia, Pennsylvania, June 23-26, 2003. Sponsored by the Environmental and Water Resources Institute of ASCE. This collection contains 380 papers intended to advance communication among water and environmental professionals and to provide an avenue to demonstrate the latest technological advances. Topics include: water infrastructure security; genetic algorithms; incorporating hydrology and hydraulics; software in engineering education; mini-symposium on integrated SW and GW modeling; HEC-HMS and HEC-RAS; K-12 and engineering education; assessing infrastructure vulnerability; water issues in Pennsylvania; watershed management and restoration; student issues; international water resources management and issues; environmental policy and documentation; history of hydrologic models; EWRI standards development; dam safety, addressing the infrastructure report card; urban hydrology and drainage; GIS, NEXRAD, wetlands, etc.; environmental water resource systems analysis; and irrigation and drainage water quality modeling.